Rotary pump



Oct. 2, 1956 F. SCOGNAMILLO RO TARY PUM P Filed April 5, 1954 INVENTOR.

FRANK SCOGNAMILEO BY v ATTORNEY United States Patent ROTARY PUMP Frank Scognamiilo, Glen Rock, N. J. Application April 5, 1954, Serial No. 421,059

1 Claim. (Cl. 103-136) The invention herein disclosed relates to rotary pumps and like displacement machines, in which piston blades are slidingly confined in radial slots in a rotor operating eccentrically in a cylindrical chamber.

Objects of the invention primarily are to provide autornatic self-sealing and wear-compensating engagement of the sliding piston blades with the walls of the enclosing chamber.

Further special objects of the invention are to accomplish these desirable results in a simple, inexpensive and thoroughly practical form of construction.

Basically the invention comprises the formation of the pump or working chamber with end walls convergently inclined toward the outer periphery and the formation of the sliding piston blades with corresponding convergently inclined end edges which will mate with and conform to the convergently inclined end walls of the chamber.

Additional novel features and accomplished objects of the invention are set forth and will appear more fully as the specification proceeds.

The drawing accompanying and forming part of the specification illustrates present preferred embodiments of the invention but structure may be modified and changed as regards the immediate disclosure, all within the true intent and scope of the invention as hereinafter defined and claimed.

Fig. 1 in the drawing is an end view of a pump incorporating features of the invention, showing the rotor and sliding blades within the working chamber as they appear on removal of the end or cover plate of the P p;

Fig. 2 is a broken vertical sectional view of the machine on substantially the plane of line 22 of Fig. 1;

Fig. 3 is a similar view on a reduced scale, illustrating a modified form of the invention.

In the several views the shaft of the pump or rotary machine is indicated at 5, carrying a rotor 6 having radial slots 7 slidingly receiving the blades 8 operating in the eccentrically related chamber defined by the cylindrical peripheral wall 9 and the spaced, opposed end walls 10 and 11.

The invention is distinguished from prior constructions of this nature in that the end walls of the working chamber are convergently inclined toward the outer peripheral wall, as indicated at 12, and that the blades 8 are correspondingly inclined at their ends, as indicated at 13, so that with outward sliding movement resulting from centrifugal action the blades will closely follow and fit themselves to the convergent end walls of the chamber.

It results from this construction also that with normal wear the blades will accommodate themselves to the walls of the chamber and accomplish, in effect, self-sealing engagement.

While centrifugal force may ordinarily be relied upon to insure close fitting engagement of the blades with the convergent end walls of the casing, special means may be provided to thrust the blades outwardly into close fitting, sealing engagement with these walls, such as springs in back of the blades or special guide tracks which will positively thrust the blades outward.

Fig. 3 illustrates a form of the invention in which the outwardly tapered blades are thrust radially outwardly in positive fashion by means of an annular track 14 on one end wall of the casing concentric to the outer peripheral wall and positioned for riding engagement by the inner edges of the blades.

The construction disclosed is relatively simple and can be produced at low cost. The number of blades may vary to meet different requirements.

The center section providing the outer peripheral cylindrical wall 9 may be equipped with suitable inlet and outlet ports such as indicated at 15, 16 at opposite sides of the line of eccentric engagement of the rotor with the surrounding cylindrical wall, Fig. l. Ordinarily this pump rotor or other rotary machine may be reversible so that either port may serve for inlet or outlet purposes. v

The ends of the rotor and end walls of the casing may be readily finished in conical, matching formation and the ends of the blades may be readily trimmed to match the conical walls of rotor and casing. Once assembled, the blades will automatically follow and conform to the frusto-conical casing formation, compensating themselves to wear in use.

What is claimed is:

A rotary machine comprising a casing having opposed end walls connected by a cylindrical wall and forming therewith a cylindrical chamber, a shaft journaled in said chamber and in eccentric relation therewith, a concentric rotor on said shaft in eccentric relation to the surrounding cylindrical chamber and in substantially tangential engagement therewith at one point, ports in said chamber opening through said cylindrical wall at diametrically opposite sides of the rotor and at opposite sides of said point of tangency of the rotor with said cylindrical wall, said rotor having radial slots therein, radially disposed blades slidingly confined in said slots with their outer longitudinal edges opposed to and in cooperative relation to the surrounding cylindrical wall, said blades having end edges convergently inclined radially outwardly of the shaft and said end walls having corresponding convergent, outwardly inclined, opposed faces cooperatively related to said convergently inclined end edges of the blades, said convergent end faces being concentric with respect to said cylindrical wall but eccentric to the shaft center and parallel crescent shaped flat annular lands on said end walls concentric with said cylindrical wall and extending from a point of least expanse at the ported side of the chamber to a point of greatest extent at the opposite side of the chamber into continuous circular conjunction with the inner circumference of the convergent end faces and said blades having end portions at the inner edges of the same in sliding engagement with said crescent shaped parallel lands of the end walls and thereby guided to center the convergent end edges of the blades between said convergently inclined end faces.

References Cited in the file of this patent UNITED STATES PATENTS 

